This classic French dish features thinly sliced potatoes layered with creamy custard and baked until golden and tender, creating a luxurious side dish that's crispy on top and silky within. With just a few simple ingredients, you'll create an elegant gratin that pairs perfectly with roasted meats and elevates any dinner table. The aroma alone will have everyone anticipating this timeless Alpine delicacy.
⏱️80 min
📊Easy
👥6 servings
🍽️Main
vegetarianfamilyfestive
Ingredients
1200 gpotatoes (Yukon Gold or waxy variety)
400 mlwhole milk
200 mlheavy cream
3 piecesgarlic cloves
5 gsalt
0.5 teaspoonground nutmeg
0.25 teaspoonwhite pepper
30 gbutter
Instructions
1PREPARE THE BAKING DISH: Lightly rub the inside of a 9x13 inch (23x33 cm) gratin dish with the whole garlic cloves, then coat with butter, ensuring all surfaces are well covered. This prevents sticking and imparts subtle garlic flavor throughout the dish. Set the prepared dish aside while you prepare the remaining ingredients.
2INFUSE THE CREAM MIXTURE: Combine the milk and heavy cream in a saucepan and warm over medium heat until steam rises (approximately 65-70°C or 150-160°F), then add the remaining peeled garlic cloves. Remove from heat, cover, and let steep for 15 minutes to develop deep garlic flavor. This gentle infusion method prevents the garlic from becoming bitter while enriching the custard base.
3SEASON THE CUSTARD: Strain the infused cream mixture through a fine-mesh sieve to remove the garlic pieces, then stir in salt, ground nutmeg, and white pepper to taste. The subtle warmth of nutmeg is essential to this traditional dish, so don't skip it. Adjust seasonings carefully as they will concentrate slightly during baking.
4SLICE THE POTATOES: Using a mandoline slicer or sharp knife, cut potatoes into thin, uniform slices approximately 2-3mm thick, working quickly to prevent browning. As you slice, immediately place potatoes in a bowl of cold water to remove excess starch and prevent discoloration. Pat dry gently with a clean kitchen towel just before layering to ensure the cream mixture properly coats each slice.
5LAYER THE GRATIN: Arrange half of the dried potato slices in slightly overlapping layers in the prepared gratin dish, then pour half of the infused cream mixture over them, ensuring it seeps between the layers. Add the remaining potato slices in the same overlapping pattern, then carefully pour the remaining cream mixture over the top, ensuring all potatoes are covered by approximately 1cm of liquid. The cream should mostly cover the potatoes but shouldn't overflow the dish.
6BAKE THE GRATIN: Preheat your oven to 180°C (350°F) and bake the gratin uncovered for 50-60 minutes until the top is golden brown and a knife inserted into the center meets slight resistance with tender potatoes. The cream will bubble around the edges and gradually reduce, creating a rich, silky custard. If the top browns too quickly, loosely cover with aluminum foil for the final 15-20 minutes, then uncover to finish crisping.
7REST AND SERVE: Remove the gratin from the oven and allow it to rest for 10 minutes before serving, which allows the custard to set slightly and makes portioning easier while maintaining creamy texture. The gratin should be served warm and can be scooped directly from the dish, with each portion showing beautiful layered potatoes suspended in silky cream. Any leftovers can be refrigerated and reheated gently in a low oven.